// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#if canImport(Combine) && swift(>=5.0) && canImport(FirebaseAuth)

  #if os(iOS) || targetEnvironment(macCatalyst)

    import Combine
    import FirebaseAuth

    @available(swift 5.0)
    @available(iOS 13.0, macCatalyst 13.0, *)
    @available(macOS, unavailable)
    @available(tvOS, unavailable)
    @available(watchOS, unavailable)
    extension MultiFactorResolver {
      /// A helper function that helps users sign in with a second factor using a `MultiFactorAssertion`.
      /// This assertion confirms that the user has successfully completed the second factor.
      ///
      /// - Parameter assertion: The base class for asserting ownership of a second factor.
      /// - Returns: A publisher that emits an `AuthDataResult` when the sign-in flow completed
      ///   successfully, or an error otherwise. The publisher will emit on the *main* thread.
      public func resolveSignIn(with assertion: MultiFactorAssertion)
        -> Future<AuthDataResult, Error> {
        Future<AuthDataResult, Error> { promise in
          self.resolveSignIn(with: assertion) { authDataResult, error in
            if let error = error {
              promise(.failure(error))
            } else if let authDataResult = authDataResult {
              promise(.success(authDataResult))
            }
          }
        }
      }
    }

  #endif // os(iOS) || targetEnvironment(macCatalyst)

#endif // canImport(Combine) && swift(>=5.0) && canImport(FirebaseAuth)
